General Setup in 3d applications
To set up a soft cover object like a bush where you can run and shoot through but not see through) you have to give your object a proxy object witch got own material ID. This is physicalized as obstruct.
Setup in Sandbox
Place your object as vegetation and turn on hidable. The surface type of your obstruct hull need to be obstruct.
Debugging p_draw helpers 1
is activating you physic proxies. You should see your soft cover helper as gray transparent box.